The Famous Ebbinghaus Forgetting Curve

The famous Ebbinghaus forgetting curve:

A) showed that long-term potentiation failure is the primary cause of forgetting.
B) demonstrates that much of what we forget is lost relatively soon after we originally learn the information
C) demonstrated that encoding failure is the primary reason we forget most information.
D) showed that the "magical number" of items that can be held in short-term memory is four, plus or minus one, and not seven plus or minus two, as had been believed.